Feeding mechanisms for sewing machines



Sept. 22, 1959 H. HACKLANDER FEEDING MECHANISMS FOR sawmc MACHINES 5Sheets-Sheet 1 Filed June 7, 1957 INVEN TOR. Hans Hack/under w vwmq NWN- \.|"1w u. I- v 1 l l -l 1w m 0. 9. m WW QM w. m M. Q NN mm I E 4 8 2mm i i1 Q p. W M I! w Q :1! W fi i! m .1. in twahfar ATTORNEY Sept. 22,1959 H. HACKLANDER FEEDING MECHANISMS FOR SEWING MACHINES 5 Sheets-Sheet2.

Filed June 7, 1957 INVENTOR. Hans Hack/under Z ZITTORNEY p 22, 1959 H.HACKLANDER 2,905,12@

FEEDING MECHANISMS FOR SEWING MACHINES 5 Sheets-Sheet Filed June '7,1957 2 3 4 &

Fig. 3.

INVENTOR.

Hans Hack/under ATTORNEY Sept. 22, 1959 H. HACKLANDER FEEDING MECHANISMSFOR SEWI ENG MACHINES 5 Sheets-Sheet 4 Filed June 7, 1957 INVENTOR. HansHack/under BY yjfi j fl asud ATTORNEY Sept. 22, 1959 H. HACKLANDERFEEDING MECHANISMS FOR SEWING MACHINES 5 Sheets- Sheet 5 Filed June 7,1957 INVENTOR. Hans Hack/under ATTORNEY Patented Sept. 22, 1959 I TheSinger. Manufacturing Company, Elizabeth, N.J.,

a corporation of-New Jersey.

Application June 7, 1957,Serial No. 664,385

10 Claims; (Cl.-'112--212) The present invention relates to a feedingmechanism for sewing machines and panicutarlyto a four-motion typefeeding mechanism;

In applicants copending application Serial No. 609,836 there isdisclosed and claimed a sewing machine designed to accommodate a numberofdifierent attachment mechanisms and toward this end is designed to beprovided with a pair of vertically spaced parallel attachment driveshafts which extend longitudinally of the bracket arm and which may beused individually or in combination. One of the primary objectsof thepresent invention is to provide a feeding mechanism and specifically afour motion feeding mechanism carriedby the bracket arm of the machineand operating on the upper surface of the work, which feeding mechanismis designed for use with a sewing machine as disclosed'in my above notedapplication Serial No. 609,836and which is designed to be ac tuatedbythe same two-attachment drive shafts.

' It is a further object of this invention to provide a top four motionfeeding mechanism for a sewing=machine, whichmechanism is relativelysimple, economical,- dependable, efiicient and easy to operate andadjust.

" Having in mind thefabove and other objects that will be evident'froman understanding of this disclosure, the invention comprises thedevices, combinations and arran ements ofparts as illustrated in thepresently prefeired embodiment of theinvention whichis hereinafter setforth in such detail 'as' to enable those skilled in the artreadilytounderstand thfunction, operation, construction and advantagesofitwhen read in conjunctionwith the accompanying drawings in which:

, Fig; l is a fragmentary vertical sectional'view longitudinally of asewing machine embodying the present invention. p 7

Fig.2 is a horizontalsectional view longitudinally of the bracket arm ofthe sewing machine illustrated in Fig.1.

Fig. 3 is a vertical sectional view taken substantially entire lin 3 -3of Fig. l. v

Fig. 4 is a fragmentary elevational view of the head end of the sewinmachine-illustrated in Fig. 1 with the face platerer'noved.

Fig. 5 is an enlarged fragmentary detail view illustrat ing the feedingmechanism per se in elevation.

Fig. 6is an enlarged fragmentary detail view in top plan of the drivinconnection-for the feed lift shaft.

Fig. 7 is a fragmentary detail sectional view taken sub stantiallyentire line 7 7 of Fig. 5.

The present invention is herein disclosed as embodied in a sewingmachine as disclosed and claimed in my prior application Serial No.609,836 to which application reference may be hadfol' a more completedescription of the machine. As disclosedin the drawings, the illustratedmachine ccm nsesatrame having a bed 1 from'the one end of which risesastandard Zcarrying' a bracket arm 3 that-terminates in a head 4.= Theopen end of the head dis closed by aface plate'5 and the open'top ofthebracket ar'm sis closed bya top cover plate 6. Journaled longitudinallyof the bed 1 is a driven rotarymain shaft 7 A needle bar 8 is mountedvertically for endwise reciprocatory movement in the head 4. To impartreciprocation to the needle bar 8, there is a rock lever indicated.generally as 9, arranged longitudinally of the bracket arm 3 and havinga hub 10 secured to a pivot shaft 11 that is journaled transversely ofthe bracket arm 3, A lever arm 12 extends from the hub 11 toward thehead 3*"and the free end thereof is connected to the needle bar 8. Asecond lever arm 15 extends from the hub 11 toward the standard 2 andthe free end thereof is con-, nected by a pitman 16 to a crank 17 on themain shaft 7.

The bracket arm 3 is provided with two sets of aligned bearingscomprising an upper set including a bushing 18provided in a boss 19 atthe standard end of the bracket arm and two bushings 20 provided inbosses 21 atthe head endof the bracket arm, and a lower setof bearingsincluding a bushing 22 secured in a boss 23 at the standardend of thebracket arm and two bushings 24 provided in bosses 25 at the head end ofthe bracket arm. An upper attachment drive shaft 26 is journaled in thebushings 18 and 20 and a lower attachment drive shaft 27 'is journaledin the bushings 22' and 24. With reference to my prior applicationSerial No. 609,836, these attachment drive shafts are designed to beused either singly or in combination to actuate any selected one of anumber of different attachment mechanisms. In accordancewith the presentinvention, both of these attachment drive shafts are used for a topfourrnotion feeding mechanism ashereinafter disclosed, the shaft 26comprising the feed lift shaft and the shaft 27 comprising the feedadvance shaft.

As is fully disclosed in my prior application Serial No. 609,836, and ascan be seen in Fig. 2, the bracket arm 3 is angled relatively to the bedto position the head 4 forwardly relatively to the standard, thusincreasing the visibility at the pointof stitch formation and alsofacilitating reaching behind the head 4 in the manipulation of the work.Also,- the ends of the lever arms 12 and 15 of the rock lever 9 arelocated on a line normal to the pivot axis of therock lever 9 to avoiddistortion at the pivotshaft 11. Further, the attachment drive shafts 26and 27 are to be arranged parallel to the mainshaft 7 to avoid thenecessity of complicated drive connections, and at the same time, mustbe arranged longitudinally of the bracket arm 3 without interfering withthe oscillation of the rock lever 9; Thus, in the construction disclosedand claimed in my prior application Serial No; 609,836, the attachmentdrive shafts 26 and 27 are disposed in vertically spaced relationparallel to the main shaft 7 with theupper shaft 26 passingover thehubNot the rock lever 9 and the lower shaft 26 passing under the hub 10,and the lever arms 12 and 15 are spaced laterally on the hub 10 with thelever arm 12 disposed wholly in front of the shafts 26 and 27 and thelever arm 15 disposed wholly to the rear of the shafts 26 and 27. Inthis construction, the shafts 26 and 27 are therefore angled through thebracket arm 3 so that at the head end of the machine they are disposedto the rear of the bracket arm and at the standard end they are disposedat the front of the bracket arm.

In the illustrated machine there is a presser mechanism comprising apresser foot 28 mounted upon the lower end of a presser bar 29 that ismounted for cndwise sliding in the head 4. The presser lifter mechanism.coinprisesa collar 30 fast on the presser bar 29 and connected by a link31 to one armrof a bell crank lever 32, the-other arm of which isconnected by a link 33 to a crank arm 34 secured on a presser liftershaft 35 journaled transversely in the standard 2 and having anoperator-aotuatedlever arm 3613i: the rear of the standard The resserfoot acts to hold the work down against a throat plate 37 and incooperation with the feed dog 38 of a lower four-motion feedingmechanism details of which are not shown.

In accordance with the present invention there is pro-- vided a topfour-motion feeding mechanism comprising a vertically arranged feed bar39 carrying a feeding foot 40 at its lower end. The feed bar 39 isguided for movement 1n a vertical plane parallel to the line of stitchformation by a strap 41 secured to the end of the head 4 by screws 42and having a groove 43 in which the feed bar 39 moves, the feed bar thusbeing held loosely between the end of the head 4 and the bottom of thegroove 43 in the strap 41.

Adjustable feed advance movements are imparted to the feed bar 39 by thelower attachment drive shaft 27 which s used as the feed advance shaftthrough a vertically arranged crank arm 44 secured on the head end ofthe shaft 27 and connected at its free end by a link 45 to anintermediate point on the feed bar 39. Thus, oscillation of the shaft 27will impart feed advance movements to the feed bar 39. Oscillation isimparted to the shaft 27 by a crank arm 46 mounted on the standard endthereof and connected by a pitman 47 arranged vertically in the standard2 to an adjustable eccentric 48 forming one of the elements of a doubleadjustable eccentric 49 mounted on the main shaft 7.

Rising and falling movements are imparted to the feed bar 39 by theupper attachment drive shaft 26 which is used as the feed lift shaftthrough a horizontally arranged crank arm 50 mounted upon the head endof the shaft 26 and connected at its free end to the upper end of thefeed bar 39. Thus. oscillation of the shaft 26 imparts movement to thefeed bar 39 toward and away from the throat plate 37. Oscillation isimparted to the shaft 26 by a pitman 51 arranged vertically in thestandard 2 :and connected at its lower end to an eccentric 52 whichforms the other element of the double adiustable eccentric 49. At itsupper end. the pitman 51 is pivotally connected to an intermediate pointon a lever 53 (Fig. 3) by a pivot 54 secured to the lever 53 by a setscrew 55 and having the ends thereof upon the opposite sides of thelever 53 jou-rnaled freely in the bifurcated end of the pitman 51. Thelever 53 has a hub 56 (Fig. 2) at one end which is loosely journaled onthe shaft 26 and at its free end is formed as a fish-tail 57 having aV-shaped slot defined bv a 'pair of edges 58 and 59 that diverge from athroat 60. A crank arm 61 is provided with a bifurcated hub havingapertured tines 62 that are mounted on the shaft 26 on op osite sides ofthe hub 56 of the lever 53, and are secured thereon by set screws 63. Atits free end. the crank arm 61 has a transverse pivot pin 64 securedtherein by a set screw 65. u on which pin 64 is loosely journaled oneend of a connecting link 66. the pin 64 extending throu h tines 67 inthe bifurcated end of the link 66. The other end of the link 66 isbifurcated to provide tines 68 which are arranged upon the op osite sideof the fish-tail 57 in the end of the lever 53. A pin 69 extends betweenthe tines 68. A wire spring 70 is wrap ed around the hubs 71 on thetines 67 for the pivot pin 64 and the o posite arms thereof overlie thecrank arm 61 and the links 66 to bias them to collapse about the pivotpin 64. A coil spring 72 is dis osed on the shaft 26 and has one endthereof anchored in a bore 73 in a collar 74 secured to the shaft 26 byset screws 75. The other end of the spring 72 overlies the lever 53 tobias it in a clockwise direction as seen in Fig. 5.

' To lift the feeding foot 40 from the work. such as for introducinwork. there is a stud screw 76 threadedinto the collar 30 on the presserbar 29 and extending into an opening 77 in the feed bar 39. The opening77 is elongated vertically and horizontally to provide in effect a lostmotion connection for accommodating feeding movements of the feed bar 39independently of the stud screw 76. When the presser foot 28 is lifted,the screw 76 moves upwardly with the presser bar 29 and when it con- 4 Itacts the top of the opening 77, continued raising of th presser bar 29will also raise the feed bar 39.

In the operation of theffeed lifting and lowering mechanism, as thepitman 51 israised by the eccentric 52, the lever 53 is pivoted upwardlyor in a counterclockwise direction as seen in Fig. 5 about the axis ofthe shaft 26. This movement is transmitted directly to the feed liftshaft 26 through the spring 72 to turn the shaft and through the crankarm 50 to lower the feed bar 39 and the feeding foot 40 toward the work.As soon as the feeding foot 40 contacts the work, indicated at W in Fig.5, and is thus held against further downward movement which also holdsthe shaft 26 against further turning, continued rising of the pitman 51will cause the lever 53 to pivot about the shaft 26 on-which it isjournaled, the relative motion of the lever 53 relative to the shaft 26being taken up in the yielding of the spring 72 so that the spring 72resiliently biases the feeding foot 40 into operative engagement withthe work. The throw of the eccentric 52 is adjusted to provide forfeeding of the minimum thickness of work to be encountered. Thus, as thethickness of the work varies, as for example by a cross seam such asindicated as S in Fig. 5, the amount that the shaft 26 is turned will bevaried. More particularly, with reference to Fig. 5, there isillustrated a full line and dotted line position of the parts. In thefull line position a minimum thickness of the work W, represented by asingle thickness, is illustrated beneath the feeding foot 40, and, inthe dotted line position, a maximum thickness of work represented by thecross seam 5 is illustrated beneath the feeding foot 40. Thepitman 51 isillustrated in its position of maximum rise. In both cases, the amountof turning imparted to the lever 53 is the same, and in both cases, thefeeding foot 40 is biased against the work by the same force, which isthat of the spring 72. However, the vertical position of the feedingfoot is varied in accordance with the variation in the thickness of thework, and the variation in the posititon of the parts is taken up by theyielding of the spring 72.

While the pitman 51 is lifting the lever 53 and, through the spring 72,turning the shaft 26, the crank arm 61, link 66 and lever 53 will remainin the relative position as illustrated in full lines in Fig. 5, i.e.,with the pin 69 of the link 66 seated in the throat 60 of the fish-tailat the free end of the lever 53. When further turning of the shaft 26 isprevented by engagement of the feeding foot 40 with the work, the crankarm 61, which is secured to the shaft 26, is also held against furtherturning and continued rising of the pitman 51 will pivot the lever 53relatively to the crank arm 61, thus moving the pin 69 out of the throat60. As the pitman 51 is lowered by the eccentric 52, the lever 53 willbe turned in a clockwise direction as seen in Fig. 5. The spring 72 willbe relaxed while still holding the feeding foot 40 in engagement withthe work until the pin 69 is seated in the throat 60. In this positionthe spring 72 is captive and there is then a direct connection from thepitman 51, through the lever 53, pin 69, link 66 and crank arm 61 to theshaft 26 so that continued lowering of the pitman 51 will pivot theshaft 26 to lift the. feeding foot 40 from the work.

The connection at the pin 69 and fish-tail 57 comprises in effect a lostmotion connection which is designed to accommodate the relative motionbetween the lever 53 and crank arm 61. If the pin 69 were separated fromthe lever 53 as it moves out of the throat 60, there would be a slapwhen they were brought back into contact, which would generateconsiderable noise at high speeds. To hold the pin 69 continually inengagement with the lever 53, there is provided the spring 70 whichtends to pivot the link 66 relatively to the crank arm 61 in a directionto hold the pin 69 against the edge 58 of the fish-tail. The edge 58formed to extend radially outwardly of the throat 60 relatively to thepivot axis of the link 66, which is the axis of the pivot pin 64. As thepin 69 is moved out of the throat 60 by the turning of the lever 53toward the crankaarm 61,1 theciink-Gfi is pivoted by the spring 70sothat the pin*69nwill-slide along the edge 58. As seenin Fig..5,.theamount that the pin 69 moves out of .the throat 60 depends upon thethickness of the work. In the-full line position-which represents aminimum thickness, the pin 6moves1out of the throat 60 an imperceptibleamountsin'ce the pitman SI has virtually completed its rise by the timethe feeding foot 40 has cont-actedthe work and thusstopped the turningof the shaft -26 and crank arm 61; In the dotted line position, whichrepresentsva maximum thickness, the pin 69 moves out ofthe' throat 60and slides along the edge 58 substantially to the end. The spring 72 isstronger than the spring 70 so that as the lever 53 is pulled down bythe pitman- 51, the link 66 will be pivoted against the action of thespring 70 by the 'camnaction between the pin 69 and edge 58 as'the pin:68 slides along the edge 58and returns to the throat 60; -When in thethroat 60, the pin 69 constitutes a direct tension connection betweenthe lever 53and link 66,

The timing of the advance movements and the rising and falling movementsof thefeedinglfoot40 are such that the advance movementlof'the'feedingfoot 40 in a feeding stroke is madelwith the feeding foot 40 lowered inengagement with the work and thereturn movement occurs when the feedingfoot '40 is out of engagement with the Work. The movements of thefeeding foot 40 are synchronized with the action of the lower feedingmechanism including the fecddog 38.

Numerous alterations of the. structure herein disclosed will suggestthemselves'to those skilled in the art.. However, it is to be understoodthat the present disclosure relates to a preferred embodiment "of myinvention which is for purposes of illustration 1 only and not'to be construed as a limitation of the invention. All such modification which donot depart from the spirit of the invention are intended to be includedwithin the: scope of the appended claims.

Having thus set forth the nature of the invention, what I claim hereinis: r

1. In a sewing machine h ving a frame including a work support and abracket arm overhanging said work support, a feed lift shaft journaledin said frame, a feed bar carried by said frame for feeding movements,means operatively connecting said shafttosaid feed bar for impartingfeed rising and falling" movements to said feed bar upon rocking of saidshaft, and means for imparting rocking movement to said shaft comprisinga lever pivotally mounted on said shaft, a crank arm secured to saidshaft, a torsion spring surrounding said shaft and acting between saidlever and a collar adjustably secured on said shaft, and means disposedbetween said lever and crank arm for permitting motion of said leverrelatively to said crank arm in that direction which urges said shaft toturn in said one direction andfor limiting motion of said leverrelatively to said crank arm in the opposite direction, and means forimparting oscillation to said lever.

2. In a sewing machine having a framc including a work support and abracketarm overhanging said work support, a feed lift shaft journaled insaid bracket arm, a crank arm extending laterally from said shaft, afeed bar pivotally-conncctedtoisaid crank arm, .and means for impartingrocking movement to said shaft to impart rising and falling movements tosaid feed bar comprising a pair of cooperating elements including alever pivotally mounted on said shaft and a second crank arm secured tosaid shaft, s ring means operatiyely connecting said lever to said shaftfor biasing said shaft to turn in one direction, a link disposed betweensaidlever and crank arm and being pivotally carried by onevof saidelements and having a lost-motion connection with theother of saidelements, said link through the lost-motion connection permitting motionof said lever relatively to said second crank arm in that directionwhich urges said shaft d to turn insaid one direction and for limitingmotion of said lever relatively to said second crank arm in the oppositedirection, and means for imparting oscillation to said lever.

3. In a sewing machine having a frame includinga work support and abracket arm overhanging said work support, a feed lift shaft journaledin said bracket arm, a crank arm extending laterally from said shaft, afeed bar pivotally connected to said crank arm, and means for impartingrocking movement to said shaft to impart rising and falling movement tosaid feed bar comprising a pairv of cooperating elements including alever pivotally mounted on said shaft and a second crank arm secured tosaid shaft, spring means operatively connecting said lever to said shaftfor biasing said shaft to turn in one direction, a link disposed betweensaid lever and crank arm and. being pivotally secured to one of saidelements and having a lateral extension engaging the other of saidelements on the side to limit pivotal motion of said lever relativelytosaid crank arm under the action of said spring means, said element atthe point of engagement with said lateral extension having a throat andan edge extending from said throat along a line diverging radiallyrelatively to the pivot axis of said link, a spring pivotallybiasingsaid link into engagement with said edge, and means for impartingoscillation to said lever.

4. Ina sewing machine having a frame including a bed, a standard risingfrom one end of said bed, and abracket arm carried by said standard andoverhanging, said bed, a rotary main shaftljournaled in said bed, a feedadvance shaft and a feed lifting shaft journaled, in said bracket arm, afeed bar carried by said bracket arm for feed advance and return andfeed rising and falling movements in a plane defining a normal line offeed, means operatively connecting said feed advance shaft to said feedbar for imparting feed advance and return movements theretoupon'actuation of said shaft, means operatively connecting said feedlifting shaft to said feed bar for imparting feed rising and fallingmovements to said feed bar upon actuation of said shaft, a pair ofeccentrics on said main shaft, a pair of pitmans extending through saidstandard and operatively connected individually to said eccentrics,means operatively connecting a first one of said pitmans to said feedadvance shaft for actuating said feed advance shaft upon rotation ofsaid main shaft, and means operatively connecting the second one of saidpitmans to said feed lifting shaft foractuating said feed lifting shaftupon rotation of said main shaft, said last mentioned means including aresilient connecting element that is flexed upon continued movement ofsaid pitman after the feed bar is in engagement with the work foruniformly biasing the feed bar toward the work upon variations in thethickness of the work. 7

5. In a sewing machine having a frame, a main shaft journaled in saidframe, a feed lifting shaft journaled in said frame, a feed bar carriedby said frame for movement in aplane, operative connections between saidfeed bar and said main shaft for imparting feed advance and returnmovements to said feed bar upon rotation of said main shaft, meansoperatively connecting said feed lift ing shaft and said feed bar forimparting feed rising and falling movements to said feed bar uponactuation of said feed lifting shaft, and means for actuating said feedlifting shaft comprising an actuating element on said main shaft, apitman operatively connected to said actuating element for impartingendwise movement to said pitman upon rotation of said main shaft, alever pivotally mounted on said feed lifting shaft and pivotallyconnected to said pitman, resilient means connecting said lever to saidfeed lifting shaft for biasing said shaft to turn in a direc tion tomove the feed bar toward the work, and means forholding said resilientmeans captive during that portion of the feeding cycle when said feedbar is outside the range determined by the maximum anticipated thicknessof the work and during the remaining portion of 7 the cycle when saidfeed bar is out of engagement with the work.

6. In a sewing machine having a frame, a main shaft journaled in saidframe, a feed lifting shaft journaled in said frame, a feed bar carriedby said frame for movement in a plane, operative connections betweensaid feed bar and said main shaft for imparting feed advance and returnmovements to said feed bar upon rotation of said main shaft, meansoperatively connecting said feed lifting shaft to said feed bar forimparting feed rising and falling movements to said feed bar uponactuation of said feed lifting shaft, and means for actuating said feedlifting shaft comprising an actuating element on said main shaft, apitman operatively connected to said actuating element for impartingendwise movement to said pitman upon rotation of said main shaft, alever pivotally mounted on said feed lifting shaft and pivotallyconnected to said pitman, resilient means connecting said lever to saidfeed lifting shaft for biasing said shaft to turn in a direction to movesaid feed bar toward the work, means operatively connecting said leverto said feed lifting shaft for turning said shaft in the oppositedirection, said last mentioned means including a lost-motion connectionto provide for relative motion between the same and the lever when saidfeed bar is in contact with the work and is thereby held against furthermovement.

7. In a sewing machine having a frame, a main shaft journaled in saidframe, a feed lifting shaft journaled in said frame, a feed bar carriedby said frame for movement in a plane, operative connections betweensaid feed bar and said main shaft for imparting feed advance and returnmovements to said feed bar upon rotation of said main shaft, meansoperatively connecting said feed lifting shaft and said feed bar forimparting feed rising and falling movements to said feed bar uponactuation of said feed lifting shaft, and means for actauting said feedlifting shaft comprising an actuating element on said main shaft, apitman operatively connected to said actuating element for impartingendwise movement to said pitman upon rotation of said main shaft, alever pivotally mounted on said feed lifting shaft and pivotallyconnected to said pitman, resilient means connecting said lever to saidfeed lifting shaft for biasing said shaft to turn in a direction to movesaid feed bar toward the work, a crank arm secured to said feed liftingshaft, means carried by the crank arm and cooperating with the free endof said lever for providing a positive connection between said crank armand said lever for turning said crank arm and thereby turning said feedlifting shaft in a direction to move said feed bar away from the workand for providing a lost-motion connection in the opposite direction forturning of said lever relatively to said crank arm and feed liftingshaft against the action of said resilient means.

8. In a sewing machine having a frame, a main shaft journaled in saidframe, a feed lifting shaft journaled in said frame, a feed bar carriedby said frame for movement in a plane, operative connections betweensaid feed bar and said main shaft for imparting feed advance and returnmovements to said feed bar upon rotation of said main shaft, meansoperatively connecting said feed lifting shaft to said feed bar forimparting feed rising and falling movements to said feed bar uponactuation of said feed lifting shaft, and means for actuating said feedlifting shaft comprising an actuating element on said main shaft, apitman operatively connected to said actuating element for impartingendwise movement to said pitman upon rotation of said main shaft, alever pivotally mounted on said feed lifting shaft and pivotallyconnected to said pitman, resilient means connecting said lever to saidfeed lifting shaft for biasing said shaft to turn in a direction to movesaid feed bar toward the work, a crank arm secured to said feed liftingshaft, a link pivotally mounted on said crank arm, and a pin carried bysaid link and underlying the free end of said lever for providing apositive connection=between said crank arm and said lever for turningsaid crank. arm and thereby turning said feed lifting shaft in adirection to move said feed bar away from'the-wo'rk and for providing alost-motion connection'in the opposite direction for turning of saidlever relatively tosaid crank arm and feed lifting shaft against theaction of said resilient means.

9. In a sewing machine having a frame, a main shaft journaled in saidframe, a feed lifting shaft journaled in said frame, a feed bar carriedby said frame for movement in a plane, operative connections betweensaid feed bar and said main shaft for imparting feed advance and returnmovements to said feed bar upon rotation of said main shaft, meansoperatively connecting said feed lifting shaft and said feed bar forimparting feed rising and falling movements to said feed bar uponactuation of said feed lifting shaft, and means for actuating said feedlifting shaft comprising an actuating element on said main shaft, apitman operatively connected to said actuating element for impartingendwise movement to said pitman upon rotation of said main shaft, alever pivotally mounted on said feed lifting shaft and pivotallyconnected to said pitman, resilient means connecting said lever to saidfeed lifting shaft for biasing said shaft to turn in a direction to movesaid feed bar toward the work, a crank arm secured to said feed liftingshaft, a link pivotally mounted on said crank arm, the free end ofsaid'lever being formed with a throat and an edge extending from saidthroat on a line diverging radially relatively to the pivot axis of saidlink, a pin carried by said link and underlying the free end of saidlever and adapted to be seated in said throat for providing a positiveconnection between said crank arm when said lever is turned in adirection to move said feed bar away from the work and adapted to movefreely out of said throat for providing a resilient connection throughsaid resilient means to provide for turning of said lever relative tosaid crank arm and feed lifting shaft against the action of saidresilient means when said lever is turned in the direction to move saidfeed bar toward said work, and resilient means for biasing said linkabout its pivot axis into sliding contact with said edge of the lever asit is moved out of said throat.

10. In a sewing machine having a frame including a work support and abracket arm overhanging said work support, a feed lift shaft journaledin said frame, a feed bar carried by said bracket arm for feedingmovements, means operatively connecting said feed lift shaft to saidfeed bar for imparting feed rising and falling movements to said feedbar upon rocking of said shaft, and means for imparting rocking movementto said shaft comprising a lever pivotally mounted on said shaft, acrank arm secured to said shaft, spring means operatively connectingsaid lever to said shaft for biasing said shaft to turn in onedirection, means disposed between said lever and crank arm forpermitting motion of said lever relatively to said crank arm in thatdirection which urges said shaft to turn in said one direction and forlimiting motion of said lever relatively to said crank arm in theopposite direction, and means for imparting oscillation to said lever.

References Cited in the file of this patent UNITED STATES PATENTS KellyIan. 28, 1958

